Identify Friend or Foe system, IFF for short, does exactly what it implies: It lets aircraft and aircraft tracking systems know if an aircraft is an enemy or a friend. Almost every single plane in the sky has a radio transponder that sends data out to any other aircraft in order to identify itself. In the commercial/civilian world, this is also one way that Air Traffic Controllers can keep track of aircraft on their radar screens. IFF is also used in fighter planes as well as by Surface to Air Missile systems to ensure only enemy airplanes are targeted and shot at.
friend or foe...no
With most military aircraft moving as fast as they do there needs to be a system where you can tell who is on your side - friend - and who is on the other side - foe. An IFF beacon Identifies who is Friend or Foe.
foe
foe
foe xoxoxoxo
A foe
Friend or Foe - song - was created in 2005-12.
Friend or Foe - album - was created in 1982-10.
Foe among friend is hidden though
fun
foe there gross
foe to the plants